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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3344e6976eed30f42fff41a22902ffde3b13ae8f2ac871198ac4ef2f9d2dba1' 
  AND token = 'qRlJ2r2l58mMBE7PQbBEZqZ1glhHiBMSI3tzbZukOX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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