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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc00d4bca2bbc489a1f4b6d72d959e1b313bbde6b1d457eece78c74cdd2ad360' 
  AND token = 'I5kvf3z9DwcSqBP8DgevbWyXfOOFdf62tlyKsfQ+xlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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