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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3285aba8e4e4edacd948f158304176984b8d792bd74193f0b9d122abcebc120' 
  AND token = 'oVA528RPfwo1/uJvTry//tBiSI1A9Bot5paOS+z1Dig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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