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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3427ee8d917667ffb0cd5c29cb30c171da07dc137f9fb8419f4cd31c9296c0e' 
  AND token = 'oKA1LgLvjbyRffcRkswZF4+Rham5zvEhumCSOtwrua4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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