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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1142f419b7e5873c3191e4fc3ae8e3e1e3e6438800c399c013c3c5a4a9189d1b' 
  AND token = 'SGMbCfD1EjLBj20co2ZQLmOixq8jkk6HFXbXiLXf6CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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