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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ec06f460c25e482958f66e9cc0a55bbe9d6706fc2b749dc31f59f020c3067b' 
  AND token = 'Fj6C5LwrfJqwp1cl0bgWLqZ7E3VNcUSKZukET6+yMpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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