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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7473824979f3f7657a9adc245b449cd1d4758ee1119ee66043720183e79f87' 
  AND token = 'oH40NEMW2HyIfW8Jdr9Yr1lZC9ny+6h/RGCYt0yNY7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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