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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89badfdcb8d3e8c09dd81a45581405d8ddf9bdfec0454e4678c43f18e0e5f4e' 
  AND token = 'TzxwmrUKUCWMSZ2NRLDJcT+04ZQJBZ3df/pN+Rf8UVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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