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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536321b051d677aa8bc03ee4a53eac9de5372035c9edbe7bdb2705cb58224562' 
  AND token = 's78l2gMCcEkH2Oy3H3X7R8Hpa3pozd2F1WLy8swKORc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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