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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036f9f4acb2a68d5de0efe184b62231ec044fea4f32709949bb95f363466b4cc' 
  AND token = '8Cu1sgq2X4NhrbUf/Uq2q9/MgbOyUy+nHNy7/nqP06U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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