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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e58a6ce9f1127f805ca190aa1430a02feab4a6f409a3a70a2f9831138573c5b' 
  AND token = 'pH0kseP0oQ2Gdv6Mo62VygWJeKrFJ5Of4/0GSrXULJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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