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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5635141557320a058c54094f27ae256732b7bd6ddcc80c06aa6cf8cb0d8affa' 
  AND token = 'eh+yOFJ1ay+f5qWwHM6ctWaSDFhxJEvMwPqifgN2Hc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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