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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a823f09f72fcb97e6638b95db147846fdcc8ca35719c4c2128c601d9722bd72b' 
  AND token = '4lOwYHzTQ9WHbkaAbhrW/pKNGMGowAOj7LpkFUsns08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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