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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a381fd107c4bf94e90959c1bb7a77d619d0db72147b6954301a05df7c7d187' 
  AND token = '02wzNgiQjWqFsLMjfOZbNR6HgXf/2cggw8usueeOxpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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