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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd98a47a225dac9604d278ae8465075575a3062ce9c5380a4504a97fe1438e15' 
  AND token = 'hFEic5u/AYSd1RBT1ZlL+iL8PQEiL1+t6ezMkWH+rdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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