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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61853e19e30100b19c6a4b4c08365078e7f0aa8f53b42eb344b2bfe1bc7eb13' 
  AND token = 'Aa1z4n2IAgwNxYpZ+tD1HOgm1bQfo4mRUsurXDSewMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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