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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e31b2bf36264eb2038ef1729463f8ff50aab489028fe2f1548c8c37e0c807d8' 
  AND token = 'mpDMavSIIB7tfgZ6At2iPzcdmSyyvNG3dJ1HSPv5+4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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