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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6002047343f780be677ddec13dfbcad360268a4907a769aefe32fdf520c7e03' 
  AND token = '+nk/mw1Lo3UPtAGoBhaWPvXKeW64qtJTdc+jD7tocd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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