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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83c7d7b26b14d01cf011ace0b22b5f88999dc79df29f7bc7a437c20469ba60c' 
  AND token = 'L0/U5Xm0D4zt9mxPA475gF/b745mFT405rC7z1+dDzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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