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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b660ae09d86970eba20a0ebb7faff97e99713f6f477090d0780c7692ba4c76a6' 
  AND token = 'zrls1+gT1ZX/F8ZWqA0tY0k57hhq+4D5NgstWM1DGpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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