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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc06d0ecc21951daf77e5e7cabf3a79284e6327bbfd96a8f9af03f5f9778c27c' 
  AND token = '5J56xNOBTV6wcD30s0i+gLyD07/IoyRRr/jQGPhpJHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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