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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999554997197c1879b206bc0e076e939c3e68602c59fb4f946ee2614f87dfe38' 
  AND token = 'Ft9XaaHIaLoOfjoNKaGYR0OJGDdYoJS2H/pPNVBhV/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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