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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaffbbaa4e41d93e26157a07fa17eb5d82ac3aea871d2c25c443b180a009c631' 
  AND token = 'OYJ4CRBaX0b5P+bLFR8M9WZaGaEE1kxvl7NvFJnTIRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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