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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71531bbee4a0ff4f13e02a46db4ebcb89ffb3bc1d2c4c3776e311717029f6103' 
  AND token = 'EWpbJTgKFu9pNzro6I3XgcAxV5QkML/bt7LQuH2QVt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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