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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc2b8618ad00ffeda8b5a50ef3994415b259990095fed244e6815af91cd0a86' 
  AND token = 'flxCG3Ps3mOw+3JrKrZH73MaGR7YwpNVWJG18cL9v9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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