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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '145fb46fbe3011489bdd08ef67a6f9adf8d10f518775a21fcb127de4e030b687' 
  AND token = '+6+ZCJif3/PsKVUSLdWwo6sfrTubfLTwwbboJs+yOVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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