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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054efd940a3eee66f96b98725de7395944b42ab95fa2487962d1848bb1817797' 
  AND token = '0o4ZhEnSyBwP+3B5s4loG2jHBdOoGHVhWb2iyMXDDSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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