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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887600f98cfd8066fe4299f4c612084ab008e9c497f1c8806e02d722e46cb197' 
  AND token = 'Chxba57vz2JyXU0l7o9gVWB/EjSf08eXpbaJNKhE6t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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