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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f777a25bd624b0f033020b49c3e87d2b57e5452a91f4d0aa876cbe45fc02fa' 
  AND token = '/NE47piB6SEyOKIPGPcvjTJttjVzszPHSUN5KS3bGjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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