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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35a892edf794547e1d8c188165330da7a23ca145a234d23c87fcd134c26ce87' 
  AND token = '41LVqSi2Rs02/OC9VARs1A7r1+pRb17uW0WBbvIBiU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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