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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e11999862873b5a72cf3ef3a112bcf72060cb0b73372f18f9e27a073656a7a' 
  AND token = 'IZ8U1p5NgwT5FfmXkgCIlauOSm290Num/Fgi4vwGxlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}