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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9377e800ffcfd3d5e61b1e3669ce68191d2f0da6c8fefc586ebb163cd0855d' 
  AND token = 'oHKsKKZ45QPG3A1RWBINP4qfAgUxOajYh/TFKTyViGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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