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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6e6ecea96c1f6f0141db5cdd48b4a4ebf8b216896eba7cda489806728e0aac' 
  AND token = 'rLOQha16rshtglLGptc78washoRyRly1irP4hIYWyWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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