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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf48403d82804737f57223243c04d137db0fdc8803b8e489be9600f05d7ad3e' 
  AND token = 'OsSP4UminmQTVKPvaYU7xIeicjzHk5H12PUXICTWdmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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