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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc33c5e5e02e46505355c4b64233b6c1a9c294d22fbaaf597b4a49eec8f2c87b' 
  AND token = '8nm9fVHS+xu9TJ2MJQr7c2OFq3jW3EKzR3GOlAvviSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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