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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b450f33c457d2fa8f1508df42e19fb004bc2c59bcea6f908b0ec7641bbf2027' 
  AND token = 'tPZ47AEA/fzo/lTFLszqhImawOzNv82xy7ogNL9m/Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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