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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926befb21228a01a9e0af2220279639df546cd3b3d721bef3c53e285e05114fd' 
  AND token = '/ssBQsDg4DcoKi8+T4Nk1ZLs+c7z2fUIkFg3URemi3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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