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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2986e61b980b197975e0bb2ee036e3e29ab71e394ef32290d078536fc53c84' 
  AND token = 'eyiq7QPer5BxUNz5s2sFJ4NXo3o44cDkg558141KTVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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