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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26fb382f16f5e5b1b8a126626ab52a37b1552b371ca2f198797b0f3be13a116' 
  AND token = 'OBElJZTR5YU7aqdbKz8BxZ/pWguJBtA1mj1zZ6fewzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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