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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d71d88167e30786cd1d4b5f10f551762bd4368a52bbbd6f6ffa4bd05bb3fbc' 
  AND token = 'qv8BHq9QCGwc9Bi1BS7WV7d8x+bGsfRRTPtliA70XCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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