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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3b674c23032960a96990b8cce7eda34bb5e60ab386af7830b39b9473d36f0a' 
  AND token = '/Qgo7pdNAuI45N7B+z4xsdR2YZF0I5bJdPWBGDRZX3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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