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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5417d6f635ad4aae161a72e47b0117863874fba78b6c5cd0d282a368af1a32' 
  AND token = 'oE6HI/0CuQKUJe23MkKCdSamQlxrMpvWvrUh9SVJ9T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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