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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359d1b1d972b76ea1ccd5ea33380441b91fa5499240298bda7ff229fac5a9c49' 
  AND token = 'ZF3n7jkNBKFfvieGF4/jaXKeBvk7uWET2zvJgAcSQi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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