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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d254f294b86e7d4a9bf9fa32779ef5f20453f38a44fca70bd5045b72f19cbf' 
  AND token = 'eU7o0gnvuVsseHje2rv6m99nAM1D3PL0XKk+pBL3rjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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