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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c30be4b00be5137cf7a1497e64ea8ffd1ba6087de8e9f4e5cfab095e5502843' 
  AND token = 'F6HClmyWw3WpYYfaC91wJQUQSH4jheeW3mb7bBGaap0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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