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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c87a32c185b38d807b0fd1ce00fc835f208c0ba96c36102f07785dffa79589a' 
  AND token = 'ihCMutF9vn7P3gqVBM3+bqMagKcpAr0THvN5MwhBKZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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