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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32495d8df1d0c4a1571c05cdf5a2629d779ba4f8ceafbc09c539c9d69ad1caba' 
  AND token = 'loH/ELTc2tsyMAlZ0yV+YqvuCZHaFBr9ISVw2hZ6hms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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