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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9cd4fb3b539adbd2727ca2868be01281d564865c8b9724e9277f2af3ae45e2' 
  AND token = '2loqpkuddbtCXL1eVj0MMzvtne7vbRc1kLGmmMGafqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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