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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd13510637900e19712b8299c0e655ab75cd6f3c2ef44ddfee1c12036a0a4a48' 
  AND token = '8Yt7QIdLrIGA6qKB8dKZD0Hs1EM8UWT9vLLjlTEAohk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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