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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f21825328df3f59269a8c8e5e543bb9cd31a6a3737d078c9bdf7870f2ab918f5' 
  AND token = 'iJg47XXs3a5t5rFBZV9d0rYALOzKPC39xS/YWXVQS4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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