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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d82e9aa4bad564263db8d5133c8f753124dc3b15b24728d6e6c15b111755fc' 
  AND token = 'lSfW8Gfq71Pi1n/JvXp3HyhEomHAxYGzkbqA9pTCOOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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