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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6413c7c8fb153af16d2e7c90b4e9818700c20a7b1c4ed765f7d1667f7947fe' 
  AND token = 'staUW3vuruuVP6TGjcZ57n5XU2UCx2ghQv1AWTRzv08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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