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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8880b5650758073230baba12db5c3175a1afb264c41eed1e8be99186155faa1' 
  AND token = 'WAkZ6w33xdy0vkAr6pZChft6t3ju5wWJT/s5nBkY1Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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